nr
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Is a scalar integer variable that is assigned a value as follows:
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If the file is connected for direct access and a record (r) was previously read or written, the value assigned is r + 1.
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If no record has been read or written, the value assigned is 1.
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If the file is not connected for direct access, or if the file position cannot be determined because of an error condition, the value assigned is zero.
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If the file is connected for direct access and a REWIND has been performed on the file, the value assigned is 1.
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